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Hydrogen-bonded assemblies of iron(II) spin crossover complexes.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 5/14/2024, Vol. 53 Issue 18, p7848-7856, 9p
- Publication Year :
- 2024
-
Abstract
- The paper reports on the synthesis, crystal structure, thermal and magnetic properties of spin crossover (SCO) salts containing the [Fe(bpp)<subscript>2</subscript>]<superscript>2+</superscript> cation (bpp = 2,6-bis(pyrazol-3-yl)pyridine) and different rigid polycarboxylate anions, such as anthracene-9,10-dicarboxylate (ADC), benzene-1,3,5-tricarboxylate (BTC) and biphenyl-4,4′-dicarboxylate (BPDC). Compound [Fe(bpp)<subscript>2</subscript>](ADC)·9H<subscript>2</subscript>O (1) shows a porous hydrogen-bonded structure with water molecules sitting in the channels. It contains low-spin (LS) Fe<superscript>2+</superscript> cations that undergo crossover to the high-spin (HS) state upon dehydration. Anhydrous 1 remains HS on cooling at low temperatures. A similar magnetic behaviour is obtained for the partially protonated BTC salt [Fe(bpp)<subscript>2</subscript>](HBTC)·5H<subscript>2</subscript>O (2), showing a spin change concomitant with dehydration to a HS phase that undergoes gradual and partial SCO on cooling, affecting 25% of the Fe<superscript>2+</superscript> cations. Instead, the BPDC salt [Fe(bpp)<subscript>2</subscript>](BPDC)·5H<subscript>2</subscript>O (3) has a ground HS state in its fully hydrated form. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 53
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 177090811
- Full Text :
- https://doi.org/10.1039/d4dt00579a